KR102032881B1 - Distribution transformer for voltage regulation of local distribution networks - Google Patents

Abstract

The present invention relates to a distribution transformer with a tap change device for uninterrupted switching between different winding taps of the distribution transformer. The overall concept of the invention is to operate both the selector contact unit and the switching means for uninterrupted load switching via a common motor drive without the intervention of the energy storage.

Description

Distribution transformer for regulating voltage in local distribution network {DISTRIBUTION TRANSFORMER FOR VOLTAGE REGULATION OF LOCAL DISTRIBUTION NETWORKS}

The present invention relates to a distribution transformer for voltage regulation of local mains. Such distribution transformers are often referred to in local literature as local mains transformers.

Historically, voltage regulation in power distribution systems already occurs at intermediate voltage levels. The increasing number of facilities capable of producing renewable energy results in substantially altered conditions at low voltage levels close to the consumer. On the one hand, by the supply of renewable energy to a point close to the consumer, the power flow in the electrical main depends on the respective supply situation, ie whether more electrical energy is extracted or supplied in a renewable manner. Depending on whether or not to change their direction should be realized. Therefore, it is now possible for the energy to be fed back to the higher main level as a result. On the other hand, the renewable supply of energy occurs in a very short-term and substantially varying extent, depending on the climate, in particular depending on wind conditions and the amount of sunshine. Therefore, it is necessary to fully consider the increased and transient voltage fluctuation, previously unknown, at low voltage mains.

In the previous typical mains, distribution transformers were operated that used a fixed translation ratio for the combination of the intermediate voltage level and the low voltage level. The compensation for the aforementioned transient voltage fluctuations, which was not noticed before, because the height is so large and no renewable energy supply has been carried out up to this point, could not have been achieved in the past by these unregulated distribution transformers and cannot be done now. As a result, there is a situation where the required voltage quality can no longer be guaranteed with such a conventional main, and therefore it is necessary and increasingly important to provide a distribution transformer that is adjustable at low voltage levels.

These correlations are described in a publication entitled "Intelligente Systemloesungen foer Verteilnetze" published in June 2011 by Maschinenfabrik Reinhausen GmbH. Moreover, two technical possibilities for the regulation of distribution transformers which have not been adjusted so far are disclosed in this publication.

On the one hand, classic adjustments are sometimes performed by tap changers with oil-switching techniques. Such tap changers are marketed by the applicant, for example under the trademark OILTAP (registered trademark).

On the other hand, so-called hybrid actuators, ie tap-changers with semiconductor switches as well as mechanical contacts, are available.

For that purpose, a distribution transformer, which should include a tapped regulating winding with winding tabs on one side, preferably on the low voltage side, can be adjusted by embodiments of both types.

DE 10 2008 064 487 A1 discloses another type of structure of this type of adjustable power distribution transformer, in which the connected step switching device is based on one or more mechanical switches. Current is temporarily conducted through the semiconductor switching element so as to be free from interruption only when switching over from one winding tap to another winding tap occurs. Therefore, this is equivalent to a hybrid switching device, ie a combination of mechanical and semiconductor switching technology.

Another form of embodiment of an adjustable power distribution transformer is disclosed in DE 10 2009 014 243 A1, in which the windings on the primary side can be short circuited via a switching matrix of the power semiconductor or via fast switching over It can be operated by the same-phase or positive-phase voltage. In that case, the output voltage remains uninterrupted during the switching process.

Finally, WO 2010/144805 A1 describes another adjustable distribution transformer that only acts as a semiconductor switching element for switching over. In that case, the semiconductor switching element and the complete solid state tap changer are arranged in a special area of the pocket structure on the upper side of the distribution transformer.

Each of these concepts has certain advantages and disadvantages. It should be noted that in the case of a structure with a semiconductor component, the semiconductor component is relatively temperature sensitive and in addition cannot be disposed directly in the insulating oil of the distribution transformer as a whole. In the case of this type of distribution transformer, the construction cost is thereby increased.

It is an object of the present invention that an adjustable transformer relies on proven vacuum technology in a tap changer, such as using a vacuum interrupter as a switching element or actuator for switching over between different winding taps on one side of the distribution transformer. It is to provide a solution for distribution transformers.

This kind of vacuum interrupter is particularly suitable for tap changers provided by the applicant of the VACUTAP® VV®, VACUTAP® VR® and VACUTAP® VM® types. Proven for many years. However, by their configuration mode and by the large volume of insulated cylinders housing the actual tap changers, they are not suitable for adoption in power distribution transformers for space reasons. For known functional reasons, this type of tap-changer according to vacuum technology as well as even tap changers of other manufacturers cannot be reduced in size in a simple manner to be suitable for distribution transformers. The reduction in size is, inter alia, an energy store with a draw-up part and a drive output part without the exception of known tap-changers of the relevant category with vacuum interrupters. It is not possible because the draw-up part is drawn up by the continuously rotating drive shaft, and the drive output part is released after the maximum up draw is achieved and it suddenly affects the actual load switching. .

This object of the invention is achieved by an adjustable distribution transformer having the features of claim 1. The subclaims relate to particularly advantageous developments of the invention.

The overall idea of the present invention is to provide a step regulating device capable of operating uninterrupted load switching over as well as selector contact units via a common motor drive without interposition of the energy storage. And providing an adjustable distribution transformer. Since the distribution transformer according to the invention does not have an energy storage in the step adjustment device, its configuration mode is simplified to the extent that the vacuum interrupter proven in the classic tap-changer can be used in the distribution transformer.

According to an embodiment of the preferred form of the invention, it is a threaded spindle arranged in engagement with a spindle nut in which the rotational motion generated by the motor drive is provided to the center slide carriage via the transmission module. A longitudinal displacement of the central slide carriage along the guide rod, whereby the remaining slide carriage is similarly longitudinally displaceable guide link. The guide link is arranged on the second side of the support plate and mechanically coupled to the central slide carriage, through which the remaining slide carriage is mechanically connected to the central slide carriage via the guide link. In this way, the selector contact Not only the unit but also the switching means for uninterrupted load switching over are thereby enabled simultaneously. Therefore, the operation of the vacuum interrupter is obtained directly from the linear movement of the selector contact unit.

According to another preferred form of embodiment of the invention, the power distribution transformer comprises a transmission module, which is fixed to the underside of the transformer cover and works with a motor drive arranged on the outside of the transformer cover. The transmission module includes a flange-like sealing module for this purpose, which is arranged directly on the underside of the transformer cover and detachably connected to the motor drive, in particular a screw connection. do. In addition, the entire load changeover switch is fixed to the transmission module. Therefore, the transmission module has the task of mounting the tap adjustment device as well as sealing against the outside of the transformer via the sealing module.

According to another preferred form of the invention, a support plate of a dielectric material, in particular a plastic material, is provided, a selector contact unit being arranged on a first side thereof, and a switching means for uninterrupted switching over on a second side. In this way, the support plates generate space from the ground needed for the on-load tap-changer.

According to another form of embodiment of the invention, one or more selector contact units during switching over are moved along two guide rods arranged substantially parallel, which guide rods guide linear guidance of the at least one selector contact unit. And is mounted by a plurality of cross members disposed on the support plate. The selector contact unit in that case includes one or more respective slide carriages as well as a contact carrier for receiving a moveable selector contact that works with the fixed selector contact.

According to another form of embodiment of the invention, the movable selector contacts are respectively received in the contact carrier and operate with the fixed selector contacts disposed on the support plate, in which the individual fixed selector contacts follow the guide rod. It is possible to connect by the longitudinal displacement of the movable selector contact, ie, the selector contact unit. By movement of the selector contact unit into and / or from the individual fixed selector contacts, the individual fixed selector contacts are connected and therefore move through the adjustment range of the on-load tap-changer. The plurality of cross members mounted to the guide rod forms a mechanical abutment for the movable selector contact that can be displaced in the longitudinal direction, in a particularly convenient manner, whereby the adjustment range is thereby mechanically limited. .

According to another preferred embodiment of the invention, switching means for uninterrupted switching over are arranged directly in the respective slide carriage of the corresponding selector contact unit. In this form of embodiment, the motor drive drives the central screw spindle via the diverter transmission, which in turn converts the rotational movement into the longitudinal displacement of the slide carriage, resulting in a movable transformer contact as well as a movable selector contact. The switching means arranged in the selector contact unit for the uninterrupted switching over of the tap adjusting device of the switch are also operable, so that the selector contact unit as well as the switching means for the uninterrupted switching over are also common without the intervention of the energy storage. It is operated by the motor drive.

According to another preferred form of the invention, a camshaft or motor which actuates not only a screw spindle whose role is operatively connected with the selector contact unit, but also a switching means for uninterrupted switching over. Driven by the drive. This enables, in a particularly advantageous manner, a simple independent operation of the selector contact unit by means of switching for uninterrupted switching over of the tap regulation device of the power distribution transformer.

Hereinafter, the present invention and advantages of the present invention will be described in more detail with reference to the accompanying drawings.
1A shows a schematic diagram of a power distribution transformer according to the present invention with a step adjustment device.
1B is a schematic perspective view of a distribution transformer according to the present invention.
1c is a schematic flow chart of a distribution transformer according to the invention with a step adjustment device.
FIG. 2A is a first side perspective view of the power distribution transformer according to FIG. 1 in which a selector contact is disposed. FIG.
FIG. 2b is a second side perspective view of the power distribution transformer according to FIG. 1 in which switching means for uninterrupted load switching are arranged.
3 is a detailed view of the guide rod of the power distribution transformer according to the present invention.
4A is a further detail of the selector contact unit of the distribution transformer according to the invention.
4B is a further detail of the selector contact unit of the power distribution transformer according to the present invention.
5 is a view illustrating a contact strip of a distribution transformer according to the present invention.
6A is a side perspective view of another form of embodiment of a distribution transformer according to the present invention.
6B is a detail view of the side perspective view according to FIG. 6A.
7A is a first side perspective view of another form of embodiment of a distribution transformer according to the present invention.
7B is a second side perspective view of another embodiment according to FIG. 7A.

The tap adjusting device 1 operating with the distribution transformer 40 according to the invention, which is arranged just below the transformer cover 2 of the distribution transformer 40, is shown in FIGS. 1 a, 1b and 1c. have. This kind of adjustable distribution transformer 40 includes a transformer bezel, which is filled with insulating oil, and one or more windings 42.1-42.3 are disposed in the iron yoke 41. The windings 42.1 to 42.3 are divided into a main winding 43 and a regulating winding 44 in the case of an adjustable distribution transformer 40, and a plurality of winding taps 45.1 to 45.3 forming a regulating range in the regulating winding. ) Is provided. In addition to this, the tap adjusting device 1 is arranged in the adjusting winding 44. The tap adjuster device 1 comprises a transmission module 3, which is attached to the underside of the transformer cover 2 and with the motor drive 4 located on the outside of the transformer cover 2. Works. The motor drive 4 may in that case be configured as a property step motor with intellectual property rights, for example. The transmission module 3 comprises a flange-like sealing module 5, which is arranged directly on the underside of the transformer cover 2 and detachably connected to the motor drive 4. , In particular screw connection. Therefore, the entire tap adjustment device 1 is fixed to the transmission module 3. The transmission module 3 performs not only the task of mounting the tap adjustment device 1 but also the hermetic sealing of the outside of the power distribution transformer via the sealing module 5.

2a and 2b show tap adjusting device 1 of a power distribution transformer according to the invention in two different side perspective views. A transmission plate 3 of dielectric material is mechanically connected to the transmission module 3, to which the individual subassemblies of the tap adjuster device 1 can be fixed. The support plate 6 is in that case made of an electrically insulating material and is configured for the purpose of accommodating all the important parts of the tab adjustment device 1. In that case, FIG. 2A shows a first side of the on-load tap adjustment device 1, in which at least a subassembly of the selector contact units 7.1, 7.2, 7.3 is fixed to the support plate 6. In the example of FIG. 2A, for example, there are three selector contact units 7.1, 7.2 and 7.3, each of which selector contact units 7.1, 7.2 and 7.3 in that case a separate phase of the distribution transformer according to the invention. phase), ie connected with the windings. Each selector contact unit (7.1 to 7.3) has its own plurality of connectable fixed selector contacts (8.1 to 8.5) electrically connected to the winding taps of the regulating winding (44) of the distribution transformer, and a load diverter And contact carriers (10.1 to 10.3) having contact rails (9) connected to LA, and two selector removably mounted movable selector contacts (11.1, 11.2). Regardless of the principle of switching over, i.e. according to the reactor switching principle or the resistance fast switching principle, in this case, one movable, such as a movable selector contact 11.1, is possible. A selector contact is connected with a first fixed selector contact such as, for example, a fixed selector contact 8. 1, and another movable selector contact such as, for example, movable selector contact 11.2 is adjacent to the first fixed selector contact, for example a fixed selector contact 8.2. A middle setting in connection with a second fixed selector contact, such as), is acceptable as a stationary operational setting of the on-load tap-changer. Therefore, according to the reactor switching principle, here nine quiescent state operation settings are possible with five illustrated fixed selector contacts (8.1 to 8.5), while an on-load tap section according to the resistive fast switching principle where intermediate setting is not allowed. In the case of ventilation, only five standstill operation settings are possible. The contact carriers 10.1 to 10.3 of each phase are mechanically fixed to the slide carriages 12.1 to 12.3 and together with the slide carriage form a structural unit. The slide carriages 12.1 to 12.3 are accommodated in two parallelly arranged guide rods 14.1 and 14.2, which are fixed to the support plate 6 via a plurality of cross members 13.1 to 13.3, in this manner. Thus, the respective fixed selector contacts 8.1 to 8.5 are connectable by the longitudinal displacement of the movable contacts 11.1 to 11.3 including the slide carriages 121 to 12.3 along the guide rods 14.1 and 14.2. For this purpose, the rotational movement generated by the motor drive 4 is transmitted via the transmission module 3 to the threaded spindle 15 arranged to engage the spindle nut 16 provided on the central slide carriage 12.2. Is transmitted, whereby a longitudinal displacement of the central slide carriage 12.2 along the guide rods 14.1, 14.2 can occur. The remaining slide carriages 12.1 and 12.3 are operatively connected to the central slide carriage 12.2 via a similarly longitudinally displaceable guide link 17 disposed on the second side of the support plate 6. In this respect the slide carriages 12. 1, 12.3 are mechanically coupled to the slide carriage 12. 2 via the guide link 17. A more detailed description of this mechanically limited guidance of the slide carriages 12.1, 12.3 through the slide carriage 12.2 can be inferred from the further figure description below for FIG. 3. The plurality of cross members 13.1 to 13.3 in which the guide rods 14.1 and 14.2 are held is mechanical butt for the movable contacts 10.1 to 10.3 that can be displaced in the longitudinal direction, including the slide carriages 12.1 to 12.3. Further parts are formed, thereby also limiting the adjustment range of the on-load tap-changer mechanically.

Figure 2b in that case shows a second side of the support plate 6 of the tap regulating device 1 of the power distribution transformer according to the invention in which switching means for uninterrupted switching over are arranged. In the embodiment of Fig. 2b, the switching means for uninterrupted switching over are vacuum interrupters 19.1 to 19.6, in which case two respective vacuum interrupters 19.1 and 19.2 or 19.3 and 19.4 or 19.5 and 19.6 are tapped. It is associated with each phase of the adjustment device 1 and works with the corresponding selector contact units 7.1 to 7.3. The vacuum interrupters 19.1 to 19.6 are switching means known in the art with movable switch contacts 20.1 to 20.6 as well as fixed contacts 18.1 to 18.6, which are not shown in more detail. Each vacuum interrupter 19. 1 to 19.6 in this respect is movable on the second side of the support plate 6 so as to be pivotally connected to the coupling elements 21.1 to 21.6 and the control levers 22.1 to 22.6 respectively. Switch contacts 20.1 to 20.6. The pivot connection between the corresponding coupling elements 21.1 to 21.6 and the control levers 22.1 to 22.6 has an upper surface 24 of the guide link 17 under partially held contact on the side facing the support plate 6. There is provided a respective rotatably mounted roller 23.1 to 23.6 which rolls along. The upper surface 24 of the guide link 17 has in this case lobe profiling, whereby the vacuum interrupters 19. 1 to 19.6 depend on the profiling of the upper surface 24 of the guide link 17. The longitudinal displacement of the guide link 17 makes it possible to connect, ie open or close it.

FIG. 3 shows a simplified detailed view of the mechanical coupling of the guide link 17 and the slide carriages 121-12.3. A transmission module 3 is shown which transmits the rotary motion via the gearwheel to the screw spindle 15, which is not illustrated here in detail, which is provided on the central slide carriage 12.2 in the rotary motion. Passed through the spindle nut 16, thereby converting the rotational movement of the screw spindle 15 into the longitudinal movement of the central slide carriage 12.2 along the guide rods 14.1, 14.2. Due to the fact that the slide carriages 12.1-12.3 are mechanically mutually coupled via the guide link 17, ultimately, through the longitudinal displacement of the central slide carriage 12.2 along the guide rods 14.1, 14.2, the two The longitudinal displacement of the carriages 12.1 and 12.3 on the other side is also generated.

4A and 4B show a more detailed view of one phase selector contact unit 7.1 of the tap adjustment device 1 in two different perspectives, illustrating this by way of example, and the selector contact unit 7.2 and 7.3 have the same structure as the selector contact unit 7.1. Therefore, the following description also applies to these selector contact units 7.2 and 7.3. The fixed selector contacts 8. 1 to 8.5 are in that case placed in the contact strip 25.1 of plastic material, for example via screw connection as illustrated herein. The contact strip 25.1 is fastened to the support plate 6 via two separate spacers 27.1 and 27.2 which are used as connection of switch-over choke (not illustrated) or switch-over resistors. . Switch-over chokes are provided according to the reactor switching principle, and switch-over resistors are provided according to the resistor fast switching principle. Furthermore, the contact strip 25.1 has a control link 26.1 on its longitudinal side, in which several lobes 28.1 to 28.4 are arranged on both sides of the plurality of lobes 28.1 to 28.4. Depending on the profile, through the lobes 28.1 to 28.4 provided in the control link 26.1, in the case of longitudinal displacement of the corresponding slide carriage 12.1, the resilient mounting of the corresponding selector contact unit 7.1 is possible. The selected selector contact (11.1, 11.2). The dimensions of the profile of the lobes 28.1 to 28.4 are such that, in that case, the movable selector contacts 11.1, 11.2 of the selector contact unit 7.1 are currently connected fixed selector contacts between two adjacent fixed selector contacts 8.1 to 8.5. The contact, here fixed selector contact 8.1, is lifted off and after switching over they are arranged to connect the next fixed selector contact, here fixed selector contact 8.2. Depending on the reactor switching principle, the intermediate setting of the movable selector contacts (11.1, 11.2) in two adjacent fixed selector contacts (8.1 to 8.5) is acceptable, while the resistive fast switching principle allows for the next adjacent fixed selector contact. Forward switching is possible. In order to achieve defined contact-making, the contact members 11.1 and 11.2 are formed to be spherical at the actual contact surface.

FIG. 5 illustrates in detail the contact strips 25.1 to 25.3 having control links 26.1 to 26.3 and their respective plurality of lobes 28.1 to 28.4, thereby allowing the selection of each selector contact unit 7.1 to 7.3. Corresponding movable selector contacts 11.1 and 11.2 or 11.3 and 11.4 or 11.5 and 11.6 are displaced vertically during the switching over process depending on the profiling of the lobes 28.1 to 28.4.

With the tap adjusting device 1 in the distribution transformer according to the invention installed, the movable switch contacts 20.1 to 20.6 of the vacuum interrupters 19.1 to 19.6 have their respective phases and therefore ultimately corresponding switches. -An electrical connection with the spacers 27.1-27.2 associated with the over choke or switch-over resistance, while the corresponding fixed contacts 18.1-18.6 of the corresponding vacuum interrupters 19. Is electrically connected. In principle, however, it may also be envisaged to undertake the electrical connection of the tap adjuster device 1 in exactly the opposite mode and manner as just described.

Another form of embodiment of a tap adjustment device 1 of a distribution transformer according to the invention is shown in FIGS. 6 a and 6b. In the description of these drawings, description is made only for parts different from the previous drawings, and the same parts are discussed with the same reference numerals as in FIGS. 1 to 5. In this form of embodiment of the tap adjustment device 1, the switching means for uninterrupted switching over, ie the vacuum interrupters 19. 1 to 19.6, have corresponding slide carriages 12. 1 to 1 to the respective selector contact units 7.1 to 7.3. 12.3) and configured to be movable along the screw spindle 15 together with the corresponding slide carriage. In this form of embodiment, each selector contact unit 7.1 to 7.3 has its own spindle nut 16 which is not shown in this example, which is arranged in the corresponding slide carriages 12.1 to 12.3, whereby the selector contact unit ( 7.1 to 7.3) are configured to be capable of simultaneous displacement along the screw spindle 15. The screw spindle 15 consists of a plurality of elements, in each case having coupling tubes 28.1 to 28.2 formed of electrically insulating material between the corresponding elements. In addition, an angle transmission is provided to pass the screw spindle 15 in the rotational movement of the motor drive 3. Between the motor drive 3 and the angle transmission 29 is arranged an insulating shaft 30 of dielectric material which introduces the rotational movement of the motor drive 3 into the angle transmission 29. The fixed contacts 18.1-18.6 of the vacuum interrupters 19. 1-19.6 disposed on the corresponding slide carriages 12. 1-12.3 are screw-connected with the support plate 6 via respective wires 31.1-31.6, and switch-over Electrical connection with a choke or switch-over resistor (not shown). The movable switch contacts 20.1 to 20.6 of the vacuum interrupters 19.1 to 19.6 make a mechanically actuated connection with the rocker arm arrangements 32. 1 to 332. with their respective rollers 31.3 to 33.6. In the state where the tap adjusting device 1 is provided, the movable switch contacts 20.1 to 20.6 of the vacuum interrupters 19.1 to 19.6 are electrically connected to the movable selector contacts 11.1 to 11.2 of the associated phases. Corresponding rollers 33.1-33.6 roll along the profiling of the guide rails 34.1-34.3 during the longitudinal displacement of the slide carriages 12. 1-12.3, whereby the respective rocker arm structures 3. 1-32. Depending on the profiling of 34.1 to 34.3, the corresponding movable switch contacts 20.1 to 20.6 of the associated vacuum interrupters 19.1 to 19.6 are connected, i.e. opened or closed. Only the fixed selector contacts 8.3 to 8.5, which are shown in this illustration, are placed directly on the support plate 6 here, and on the opposite side of the support plate 6 (not shown here). It is electrically connected with the corresponding winding tap of the regulating winding of the dedicated transformer.

Another form of embodiment of the tap adjustment device 1 of the power distribution transformer is shown in FIGS. 7a and 7b. In the case of the description of these figures, likewise, only parts different from the previous figures are described, and the same parts are discussed with the same reference numerals as in FIGS. 1 to 5. In the form of the embodiment of FIGS. 7A and 7B, the camshaft 35, as well as the screw spindle 15, which make a mechanical actuation connection with the respective selector contact units 7.1 to 7.3 by means of the motor drive 3, are also shown. Driven, thereby enabling the switching means, ie vacuum interrupters 19. 1 to 19.6, for uninterrupted switching over. Unlike the example of FIGS. 6A and 6B, the screw spindle 15 is here configured as a screw spindle over its entire length, with each slide carriage 12. 1 to 12.3 being rotated when rotation of the screw spindle 15 occurs. In a horizontally moving manner, it is engaged with the spindle nut 16 provided on each slide carriage 12. 1 to 12.3. The other selector contact units 7.1 to 7.3 have the same configuration as the selector contact units 7.1 to 7.3 described in Figs. For the operation of the vacuum interrupters 19. 1 to 19.6, each movable switch contact 20.1 to 20.6 is mechanically constrained to the stroke rods 36.1 to 36.6, so that the stroke rods are movable. A stroke rod 36.1 on the opposite side of the switch contacts 20.1 to 20.6 and operating with a cam lobe disposed on the camshaft 35, when the camshaft 35 is rotated, the cam lobe responds to a vertical motion. 36.6, and ultimately activate the associated movable switch contacts 20.1-20.6 of the corresponding vacuum interrupters 19.1-19.6. Depending on the switching sequence on which the tap adjustment device 1 is based, a plurality of cam lobes per vacuum interrupter 19. 1 to 19.6 are in this case provided around the camshaft 35.

In summary, it can be emphasized that the tap adjustment device 1 can be used not only according to the reactor switching principle but also according to the resistance fast switching principle. Depending on the underlying switchover principle, depending on the reactor switching principle, here the nine illustrated fixed selector contacts (8.1 to 8.5) allow for nine standstill operating settings, while the tap adjustments constructed according to the resistive fast switching principle. Only five stationary operating settings are acceptable for device 1.

1: tap adjustment device
2: transformer cover
3: transmission module
4: motor drive
5: sealing module
6: support plate
7.1 to 7.3: selector contact unit
8.1-8.5: Fixed selector contact
9: contact rail
10.1 to 10.3: contact carrier
11.1, 11.2: Movable selector contacts
12.1 to 12.3: Slide carriage
13.1 to 13.3: cross member
14.1, 14.2: guide rod
15: threaded spindle
16: spindle nut
17: guide link
18.1-18.6: fixed contacts
19.1-19.6: Vacuum interrupter
20.1 to 20.6: movable switch stack
21.1 to 21.6: coupling element
22.1 to 22.6: control lever
23.1 to 23.6: roller
24: Top surface of the guide link
25.1 to 25.3: contact strip
26.1 to 26.3: control link
27.1, 27.2: spacer
28.1, 28.2: Coupling tube
29: angle transmission
30: insulated shaft
31.1 to 31.6: wire
32.1 to 32: rocker arm structure
33.1 to 33.6: roller
34.1 to 34.3: guide rail
35: camshaft
36.1 to 36.6: Stroke rod
40: power distribution transformer
41: iron yoke
42.1 to 42.3: winding
43: main winding
44: adjusting winding
45.1 to 45.5: winding tap

Claims (18)

As a distribution transformer 40 for voltage regulation of local mains,
Regulating winding 44 having a main winding 43 and a plurality of winding tabs,
A tap adjusting device 1 for uninterrupted switching over between different winding taps of the distribution transformer 40,
A plurality of selector contact units (7.1 to 7.3) having their respective plurality of fixed selector contacts (8.1 to 8.5) electrically connected to the respective winding taps are arranged along the line,
The fixed selector contacts 8.1 to 8.5 can be actuated by two movable selector contacts 11.1 and 11.2 which are displaceable in the longitudinal direction,
For uninterrupted switching over, two vacuum interrupters (19.1, 19.2, or 19.3, 19.4 or 19.5, 19.6) are provided for each phase,
A motor drive 4 is provided for delivering a drive movement to the tap adjustment device 1,
The selector contact units 7.1 to 7.3 and switching means for the uninterrupted switching over can be operated directly via a common motor drive 4, so that the drive movement of the motor drive 4 is controlled by the selector contact unit ( 7.1 to 7.3) and to the switching means for uninterrupted switching over, without the intervention of an energy store,
The entirety of the tap adjustment device (1) is arranged via a transmission module (3) on the underside of the transformer cover (2). The method of claim 1,
The rotational movement generated by the motor drive 4 can be transmitted via the transmission module 3 to a threaded spindle 15 coupled with a spindle nut provided on the central slide carriage 12.2, thereby guiding the guide. A longitudinal displacement of the central slide carriage 12.2 along the guide rods 14.1, 14.2 can occur,
The remaining slide carriages 12.1 and 12.3 are operatively operated with the central slide carriage 12.2 via a longitudinally displaceable guide link which is mechanically coupled to the center slide carriage 12.2. Connected, the remaining slide carriages 12.1, 12.3 are mechanically coupled to the central slide carriage 12.2 via the guide link 17, thereby providing not only the selector contact units 7.1 to 7.3 but also the uninterrupted load switching. Switching means for over is also enabled at the same time,
Power distribution transformer. delete The method according to claim 1 or 2,
The transformer for distribution, wherein the transmission module (3) comprises a flange-like sealing module (5). The method of claim 2,
A power distribution transformer, provided with a support plate (6) of dielectric material, on which the selector contact units (7.1 to 7.3) are arranged on a first side and on which switching means for the uninterrupted switching over are arranged. The method according to claim 1 or 2,
The selector contact units 7.1 to 7.3 each operate in conjunction with at least one of a respective slide carriage 12.1 to 12.3, a respective contact carrier 10.1 to 10.3, and the plurality of fixed selector contacts 8.1 to 8.5. A transformer for distribution, comprising movable selector contacts (11.1, 11.2). The method of claim 5,
The slide carriage (12.1 to 12.3) is received by two parallelly arranged guide rods (14.1, 14.2) disposed on the support plate via cross members (13.1 to 13.3). The method of claim 5,
The movable selector contact (11.1, 11.2) is received in a contact carrier (10.1 to 10.3), respectively, and works in conjunction with a fixed selector contact (8.1 to 8.5) arranged on the support plate (6). The method according to claim 1 or 2,
The movable selector contacts 11. 1, 11. 2 are arranged to be displaceable along the guide rods 14.1, 14.2 via their slide carriages 12. 1 to 12.3, and move through the adjustment range of the tap adjustment device 1. Power distribution transformer, which becomes possible to do. The method according to claim 1 or 2,
A plurality of cross members 13.1, 13.3 form a mechanical abutment for the movable selector contacts 11.1, 11.2 that can be displaced along the guide rod 14.1. 14.2, in this manner. The power distribution transformer in which the adjusting range of the tap adjusting device 1 is mechanically limited. The method according to claim 1 or 2,
Phase-movable selector contacts 11.1 and 11.2 in each stationary operational setting may be provided with a plurality of fixed selector contacts 8-1 to 11 in the same phase of the tap adjustment device 1. 8.5), the power distribution transformer connected to at least one of. The method according to claim 1 or 2,
In each case, two movable selector contacts (11.1, 11.2) are housed in contact carriers (10.1 to 10.3) such that they are resiliently mounted. The method according to claim 1 or 2,
The movable switch contacts 20.1 to 20.6 of the corresponding vacuum interrupters 19.1 to 19.6 are pivotally mechanically connected to the coupling elements 21.1 to 21.6 and the control levers 22.1 to 22.6, respectively, The pivotable connection between the coupling elements 21.1 to 21.6 and the control levers 22.1 to 22.6 is provided with rollers 23.1 to 23.6 on the side facing the support plate 6, the rollers being partially held contacts. Rolling along the profiled top surface 24 of the guide link 17 from below, whereby the respective vacuum interrupters 19. 1 to 19.6 depend on the profiling of the top surface 24 of the guide link 17 so that the guide link The power distribution transformer which can be connected by the displacement of the longitudinal direction of (17). The method according to claim 1 or 2,
The fixed selector contacts (8.1 to 8.5) are arranged in contact strips (25.1 to 25.3), wherein the contact strips are fixed to the support plates (6) via respective spacers (27.1 to 27.3). The method of claim 14,
The contact strips (25.1 to 25.3) have a control link (26.1 to 26.3) on their side in the longitudinal direction, with several lobes arranged on both sides. The method of claim 15,
The profile of the lobe lifts off the fixed selector contact to which the moveable selector contacts 11.1 and 11.2 of the corresponding selector contact units 7.1 to 7.3 between two adjacent fixed selector contacts 8.1 to 8.5 are currently connected. off) and dimensioned such that the moveable selector contacts (11.1, 11.2) connect to the next fixed selector contact again after the switching over is completed. The method of claim 1,
Two respective vacuum interrupters (19.1 and 19.2, 19.3 and 19.4, 19.5 and 19.6) per phase are arranged directly in the corresponding slide carriages 12.1 to 12.3 of the respective selector contact units 7.1 to 7.3,
The motor drive 4 drives the central screw spindle 15 via an angle transmission 29,
Each slide carriage 12.1 to 12.3 has a separate spindle nut 16,
The screw spindle 15 works together with the spindle nut 16 of each slide carriage 12.1 to 12.3, and the rotational movement can be converted into simultaneous longitudinal displacement of the plurality of slide carriages 12.1 to 12.3. Thus, not only the movable selector contacts 11.1 and 11.2 but also the vacuum interrupters 19.1 to 19.6 can be operated.
Power distribution transformer. The method of claim 1,
The motor drive 4 drives the camshaft 35 as well as the screw spindle 15 operatively connected to the selector contact units 7.1 to 7.3, whereby the switching means for the uninterrupted switching over are activated. And, in this way, capable of operating both the movable selector contact (11. 1. 11.2) and the switching means for the uninterrupted switching over.

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